The **OMM02040E3JB3** is a part number identifying a specific **Metal Film Resistor** produced by **Vishay Beyschlag**. It belongs to the **Micro-MELF (MM)** series, which is a cylindrical Surface Mount Device (SMD) known for superior reliability and stability compared to standard thick-film chip resistors. ### 1. Key Technical Specifications The following table outlines the core electrical and physical parameters of the component: | Parameter | Specification | Details | | :--- | :--- | :--- | | **Series** | Micro-MELF (MMU 0102) | High-performance cylindrical SMD | | **Resistance Value** | **3.3 Ω** | Indicated by the "3JB3" suffix | | **Tolerance** | **± 5%** | Letter "J" in the code signifies 5% | | **Power Rating** | **0.3 W** | At 70°C ambient temperature | | **Voltage Rating** | **150 V** | Maximum operating voltage | | **Temperature Coeff.** | **± 250 ppm/K** | Sensitivity to temperature changes | | **Operating Temp.** | **-55°C to +155°C** | Suitable for harsh environments | | **Package Size** | **DIN 0102** | Approx. 2.2mm length x 1.1mm diameter | --- ### 2. Physical Construction (MELF Design) The "MELF" (Metal Electrode Leadless Face) design is distinct from traditional rectangular chip resistors: * **Cylindrical Shape:** The component is a ceramic rod with a metal film deposited on it. * **Durability:** The cylindrical structure provides better heat dissipation and mechanical robustness against board bending (flex). * **Stability:** Metal film technology ensures lower noise and better long-term stability than carbon or thick-film alternatives. ### 3. Part Number Breakdown While manufacturer codes vary slightly, the structure for this series generally follows: * **OMM:** Series identifier (Micro-MELF). * **0204:** Often refers to the physical size/power class (standardized as 0102 for Micro-MELF). * **3JB3:** The resistance code. "3" and "3" with "J" (5%) represents **3.3 Ohms**. --- ### 4. Common Applications Due to its high reliability and pulse load capability, the OMM02040E3JB3 is typically used in: 1. **Automotive Electronics:** Engine control units, lighting, and safety systems (AEC-Q200 qualified versions). 2. **Industrial Systems:** Measurement equipment and power supplies. 3. **Telecommunications:** Base station equipment requiring high stability. 4. **Medical Devices:** Precision monitoring tools.